Dry shaver transmission



NOV 29, 1949 F. TAMBoRELLo 2,489,833

DRY SHAVER TRANSMISSION Filed June 25, 1945 IN V EN TOR.

Patented Nov. 29, 1949 UNITEDl 'STATES PATENT oFFlcE 2,489,833 DRY sHAvEn TRANSMISSION Frank Tambol'ello, Milwaukee, Wis.

Application June 25, 1945, Serial No. 601,513

2 Claims. 1

This invention relates to improvements in dry shavers.

Dry shavers of the type now on the market usually have a xed, slotted face-engaging part formed of extremely thin metal, with a slotted an electric motor housed within the handle has l0 been used to actuate the cutter. The use of an electric motor, however, requiresthat a suitable" source of electric current be available, and this is not always the case. Furthermore, electric motors get out of order requiring repair or relo' placement. A

It is recognized that attempts have heretofore been made to provide aconstruction wherein a4 relatively slow reciprocation of the blade oi a' "Gillette type of razor is produced manually in 20 order to provide a shearing action. In these de-" vices, however, the hand actuated motor has caused rotation of the drive shaft irst in one direction and then in the opposite direction. This type of construction is entirely unsuited for driv- 25 ing the cutter of a modern type of dry shaver head at the high speed required.

' It is a general object of the present invention to provide a hand-actuated dry shaver of the type having a. reciprocating cutter member t'o provide an internal chamber 6 for the actuwherein there is mechanism for producing high speed operation with a minimum amount of manual effort.

A further, more specific object of the inventio is to provide a device as above described, wherein-,35

the actuating lever is responsive to a squeezing action of the hand holding the dry shaver, there 'being means inside of the handle for transformvention is to provide a dry shaver `as above described wherein the hand lever causes reciprocation of spaced actuating bars having reversely pivoted dogs which are engageable with opposite sides of a ratchet wheel, one of the dogs being eilective in one direction of movement of the handle to cause partial rotation of the ratchet wheel, and the other dog being effective when it is moved in the opposite direction to cause continued partial rotation of the ratchet wheel in the same direction.

(Cl. 'Me-129) Other objects of the invention are to provide a dry shaver which is relatively simple and inexpensive in construction, which is efficient in operation, which is easy to operae, which is neat in appearance, and which is otherwise well adapted fo'rthe purpose described.

With the above and other objects in view, the invention consists of the improved dry shaver, andall of its parts and combinations, as set forth in the claims, and all equivalents thereof.

In the accompanying drawing, illustrating one complete embodiment of the kpreferred form of the invention, in which the same reference numerals designate the same parts in all of the views,

Fig. 1 is a. longitudinal sectional view through the improved dry shaver;

Fig. 2 is a fragmentary plan view of the ratchet wheel and operating members therefor on an exaggerated scale, parts being broken away and shown in section, and the dot-and-dash lines indicating an extreme position of movement of the operating members;

Fig. 3 is a sectional view taken on line 3-3 of Fig. 2; and

Fig. 4 is a fragmentary sectional view taken on line 4-4 of Fig. 2.

IReferring more particularly to the drawing, tl'ie numeral 5 designates the handle or main body portion of the dry shaver which handle is hollow ating mechanism. Suitably supported on the outer end of the handle is the shaving head 1. The head may be constructed in various ways and one conventional type of head has been illustrated. It includes a face engaging member 8 which is slotted as at 9 to provide openings for the reception of hair. The edges of the face engagement member have inwardly extending flanges which are connected to the base portion I0 of the head. The face engaging portion 8 is formed of extremely thin metal as is common in the art. The member is preferably open at its ends to slidably receive a cutter unit II. The cutter unit includes a base I2 formed with a driving hole or slot I3. Connected to the base I2 to reciprocate therewith is a cutter member which is U-shaped in cross-section and which includes a part I4 formed of very thin metal. The part I4 is formed with a multiplicity of slots I5 as is standard practice. Hair which enters the slots 9 of the outer face engaging plate 8 projects into the slots I5 of the reciprocating cutter and is sheared as a result of the reciprocating movement. The above forms no part of the novelty of the present invention but has been described for purposes of clarity.

Slidably mounted in ,longitudinal openings Il of guideway extensions I1 is a pair of parallel actuating arms I9. The outer ends of the arms project through the handle member 5 and are iixedly connected by an operating bar Il. A pin 20 has one end secured to the bar as at 2| and has its other end projecting slidably through a hole in the casing 5 and formed with a head 22. A coil spring 23 surrounds `the pin 20 and is for the purpose of automatically returning the actuating arms I8 to the position of Fig. 1 after the bar I9 has been depressed by the action of the hand or iingers.

At the lower end of the left hand arm I6 is a laterally oiset portion 24 (see Fig. 4) having a slot 25 extending therethrough. Pivoted on a pin 26 within the slot 25 is a dog 21. A band spring 28 normally urges the dog tothe position of Fig. 2 where further movement is prevented by a shoulder 29.

The right hand actuating arm I8 also isformed with one of the laterally offset portions 24 having a slot 3|). on a pin 32 and is normally urged by a band spring 33, to the position yshown by full lines in Fig. 2 against a stop-shoulder 34. It is to be noted 'that the two dogs 21 and 3| operate Vin reverse directions from each other. The dog 21 can yieldingly pivot'in a downward are only from the position of'Fig. 2, and the dog 3| can yieldingly pivot inan upward arc only.

The dogs 21 and 3| co-act with ratchet teeth 3'5 on the inner peripheryof a ratchet ring 36. The ratchet ring is connected to a backing plate 31 in the manner illustrated in Fig. 3 and the backing plate has a central opening 39 through which a shaft 39 extends. The ends of the shaft 39 are suitably supported in the casing 5 and the backing plate, together with the ratchet ring 35 are rotatable around the shaft 39.

The outer periphery of the ratchet ring 36 is formed with gear teeth 40 which mesh with a pinion 4I rigidly mounted on a shaft 42. The shaft 42 issuitably journalled in the handle 5 and also carries rigidly thereon a bevelled gear 43 which meshes with a bevelled pinion 44 fixed to a shaft 45. The shaft 45 drives a gear 46 which is the first gear of a train of speed increasing gears. Gears 41 and 48 on a common shaft are driven by the gear 46. Gears 49 and 59 xed to a common shaft are driven by the gear 46. Gears 5| and 52, fixed to a common shaft, are driven by the gear 50. Gears 53 and 54, iixed to a common shaft, are driven by the gear 52.' Gears 55 and 56, xed to a common shaft. are driven by the gear 54. Thegear 56 meshes with a gear.- 51 onfthe inner end of a drive shaft 56. The latter has an eccentric pin 59 on its outer end which engages with the slot or opening I3 of the A dog 3| is pivoted in the slot 30 4 inthe direction indicated by the arrow in Fig. 2. While this is occurring, the dog 3| on the other side of the ratchet ring will slip over the ratchet vrotated in the same direction to cause a continuous rotation of the engaged gears. If the direction of rotation were reversed on the up-stroke the attainment of the speed necessary in a dry shaver would not be possible.

'I he rotation of the ratchet ring is, of course, at a relatively slow speed. However, the train of gears multiplies this speed so many times before reaching the drive shaft 58 that the speed of rotation of the latter isextremely high. Thus, a reciprocating movement at high speed is imparted to the reciprocatory cutter Il. The speed of the latter is comparable to that produced by the electric motors now used in dry shavers.

Various changes and modifications may be made without departing from the spirit of the invention, and all of such changes are contemplated as may come within the scope of the claims.

cutter II to cause rapid reciprocating movement d of the cutter. Bearings for the various shafts in the train of gears may be formed by holes in parl What I claim is:

l. Operating mechanism for use in a dry shaver having an'elongated substantially hollow handle formed on one side with a pair of axially bored longitudinally spaced inwardly projecting bearing bosses comprising an operating member positioned exteriorly of said handle for engagement by- `the hand of a user, a pair of longitudinally spaced parallel arms iixed to and projecting from said hand engaging member and extending slidably through and supported by said bearing bosses, said arms projecting into the interior of said handle, spring means for urging said hand engaging member away from said handle, a rotatable ratchet wheel within the handle mounted for rotation on a transverse axis, a first dog piv. otally connected to the inner end of a first one of said parallel arms and engageable with the teeth on one side of said ratchet wheel, stop means for of the ratchet wheel from said iirst dog, stopmeans for limiting pivotal movement of the sec.--

ond dog away from said operating member when the arms are moving outwardly and for permit-L. ting pivotal movement of said second dog in a4 direction toward the operating member when said arms are moving inwardly, a spring mounted on said other arm and urging said second dog toward said stop means and into engagement with the teeth of said ratchet wheel, and speed increasing gearing driven by said ratchet wheel.

2. Operating mechanism foruse inadryshaver having a substantially hollow handle comprising an operating member positioned exteriorly of said handle for engagement by the hand of a user; a pair ot parallel arms projecting from said hand engaging member and extending siidably into the interior of said handle; spring means for urging said hand engaging member away from said handle; a rotatably supported ring gearr within the handle, said ring gear being formed with internal ratchet teeth; a first dog pivotally connected to the inner end of the rst one of said parallel arms and engageable with the internal ratchet teeth on one side of said ring gear; stop means for limiting pivotal movement of said dog in a direction toward said operating member when said arm is moving inwardly and for permitting pivotal movement of said dog in a direction away from said operating member when said arm is moving outwardly; a spring mounted on said arm and urging said dog toward said stop means and into driving engagement with theteeth of said ratchet wheel; a second dog connected to the inner end of the other of said parallel arms and engageable with the teeth on the other side of the interior of the ring gear from said first dos; .stop means for limiting pivotal movement of the sec- REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 25,132 Mitchell Aug. 16,v 1859 128,240 Morton June 25, 1872 630,899 Knopf Aug. 15, 1899 1,080,637 Kenworthy Dec. 9, 1913 2,178,976 Te Pas Nov. '1, 1939 2,252,156 Bell Aug. 12. 1941 2,311,552 Law Feb. 16, 1943 

